A pile foundation protection bag and a mounting structure thereof

Abstract

The utility model discloses a pile foundation protection bag and mounting structure thereof, including framework cylinder, the outside of framework cylinder is provided with composite geotextile layer, composite geotextile layer be connected with framework cylinder through stirrup, the framework cylinder and composite geotextile layer form protection bag body jointly. The composite geotextile layer is outside the framework cylinder, and the composite geotextile layer is made of carbon fiber waterproof salt -resistant synthetic cloth, has high strength, good flexibility, good thermal property, also has better use performance under low temperature, has waterproof salt -resistant capacity, and construction is convenient, can disposable paving, need not to set up protection material, greatly reduce construction difficulty and cost, reduce the advantage of material waste, can insulate the water and soil of its outside with pile foundation hole.

Description

Technical Field

[0001] This utility model relates to a protective bag, specifically a pile foundation protective bag and its installation structure, belonging to the technical field of pile foundation reinforcement facilities. Background Technology

[0002] Since their invention, geosynthetic materials have played a vital role in soft soil foundation treatment, roadbed reinforcement, stabilization of railway and highway slopes, as well as slope protection and seepage prevention in water conservancy and building projects. Geocomposite membranes, in particular, are indispensable for groundwater seepage prevention, finding effective applications in dam seepage control, highway seepage control, railway seepage control, and subway tunnel seepage prevention. Geocomposite membranes primarily consist of a waterproof plastic membrane in the middle, wrapped with an outer protective fabric layer. Due to their poor compressive strength, a layer of medium-coarse sand of a certain thickness is often placed above and below the composite membrane to prevent damage during soil compaction. Construction often requires three steps, which is labor-intensive and costly. The membrane has drawbacks such as softening and deformation at high temperatures and hardening and cracking at low temperatures, limiting its service life under high temperature or large temperature fluctuations.

[0003] Therefore, further improvements are needed. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a pile foundation protection bag and its installation structure, which has waterproof and salt-proof capabilities, high strength and good toughness, and does not require the setting of protective materials, thereby reducing construction difficulty and cost.

[0005] The technical solution adopted by this utility model is as follows: a pile foundation protection bag, including a skeleton cylinder; a composite geotextile layer is provided on the outside of the skeleton cylinder; the composite geotextile layer is connected to the skeleton cylinder by stirrups; the skeleton cylinder and the composite geotextile layer together form the body of the protection bag.

[0006] Furthermore, the skeleton cylinder is a honeycomb geogrid; the composite geotextile layer includes a first geocomposite layer and a second geocomposite layer; both the first geocomposite layer and the second geocomposite layer are carbon fiber waterproof and salt-resistant synthetic fabrics.

[0007] Furthermore, the first geocomposite layer and the second geocomposite layer are bonded together with plant adhesive; the upper and lower ends of the composite geotextile layer are outside the length range of the skeleton cylinder.

[0008] Furthermore, the stirrups are several fiber strips distributed longitudinally along the body of the protective bag; the stirrups are wrapped around the outer surface of the composite geotextile.

[0009] An installation structure for a pile foundation protection bag, wherein several protection bag bodies are coaxially and longitudinally connected; and lowering rods are provided on both sides of the lowermost protection bag body.

[0010] Furthermore, the lowering rod is a reinforcing bar for connecting with the lifting equipment; the reinforcing bar is connected to the skeleton cylinder; and each skeleton cylinder is also provided with a connecting hook at its upper end.

[0011] Furthermore, the composite geotextile layers of the upper and lower protective bags are bonded together with plant-based adhesive.

[0012] Furthermore, a reinforcing cage is provided between the protective bag and the wall of the pile foundation hole; the bottom of the lowest part of the protective bag body is sealed.

[0013] This utility model has the following beneficial effects: This design places the composite geotextile layer on the outside of the skeleton cylinder. The composite geotextile layer is made of carbon fiber waterproof and salt-proof synthetic fabric, which has high strength, good flexibility, good thermal properties, and good performance even at low temperatures. It has waterproof and salt-proof capabilities, is easy to construct, and can be laid in one go without the need for protective materials. This greatly reduces the difficulty and cost of construction and reduces material waste. It can also isolate the grout inside the geotextile layer from the inner wall of the pile hole.

[0014] Meanwhile, the skeleton cylinder is made of HDPE material after stretching, which has high strength and can provide excellent support for the composite geotextile layer inside the pile foundation hole, ensuring the stability of the pile foundation. Finally, a lowering rod is set on the outside of the bottom protective bag body to facilitate connection with the lifting equipment, and then several vertically placed protective bag bodies are lowered. Compared with traditional technology, the advantage of this design is that it abandons the original approach of increasing the strength of the pile foundation concrete without solving the problem of corrosion prevention. It also differs from the original method of using materials added to the mud wall to protect the pile foundation. Mud wall protection can only delay water penetration; in long-term use, water carrying corrosive substances slowly seeps into the pile foundation and corrodes it. Completely sealing and isolating the water and soil environment prevents the pile foundation from being affected by underground factors, allowing the pile foundation to maintain its permanent service performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the protective bag body (bottom layer) in this utility model.

[0016] Figure 2 This is a schematic diagram showing the unfolded state of the skeleton cylinder and the composite geotextile layer.

[0017] Figure 3 This is a schematic diagram of the unfolded structure of the composite geotextile layer.

[0018] Wherein: 1 is the skeleton cylinder, 2 is the composite geotextile layer, 2-1 is the first geocomposite layer, 2-2 is the second geocomposite layer, 3 is the stirrup, 4 is the lowering rod, and 5 is the connecting hook. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] See Figures 1-3 This application discloses a pile foundation protection bag, including a skeleton cylinder 1; a composite geotextile layer 2 is provided on the outer side of the skeleton cylinder 1; the composite geotextile layer 2 is connected to the skeleton cylinder 1 by stirrups 3; the skeleton cylinder 1 and the composite geotextile layer 2 together form the body of the protection bag.

[0021] Furthermore, the skeleton cylinder 1 is a honeycomb geogrid; the composite geotextile layer 2 includes a first geocomposite layer 2-1 and a second geocomposite layer 2-2; both the first geocomposite layer 2-1 and the second geocomposite layer 2-2 are carbon fiber waterproof and salt-resistant synthetic fabrics; the surfaces of the first geocomposite layer 2-1 and the second geocomposite layer 2-2 are coated with a nano-reinforced film.

[0022] Regarding the fabrication method of the first geocomposite layer 2-1 or the second geocomposite layer 2-2, firstly, carbon fiber is woven into a fabric, and PTFE + nanofibers are mixed evenly and coated onto the woven carbon fiber fabric, with the coating being circulated and densely coated to 1-2 mm. The coated woven carbon fiber fabric is placed in a sealed box, and nanofibers are sprayed on both sides, rolled and pressed to 1-2 mm. After drying, a high-strength matrix is ​​obtained, and the surface structure is nano-reinforced to form a composite reinforced film. After repeating the above method to make two sheets, they are heated at high temperature and rolled to 2-3 mm with a geogrid. After drying, a high-strength composite with tensile strength, tear resistance, puncture resistance, waterproofing, seepage prevention, and aging resistance is formed.

[0023] Preferably, the bottom of the skeleton cylinder 1 and the composite geotextile layer 2 adopts a closed design, which together form a closed environment. The resulting closed cylinder can isolate brine and other substances in the soil that are corrosive to concrete and steel bars, thereby protecting the pile foundation and preventing it from being affected by the soil environment, thus maintaining its permanent good performance.

[0024] Furthermore, the first geotextile layer 2-1 and the second geotextile layer 2-2 are bonded together with plant adhesive; the upper and lower ends of the composite geotextile layer 2 are outside the length range of the skeleton cylinder 1.

[0025] Specifically, the composite geotextile layer 2 is 10cm longer than the skeleton cylinder so as to overlap with the adjacent composite geotextile layer; after the skeleton cylinder 1 is bonded and combined with the composite geotextile layer 2, they are rolled together into a cylindrical shape and then tied by the stirrups 3 to form a protective bag body with high strength and salt and water isolation capabilities.

[0026] Preferably, the upper and lower adjacent skeleton cylinders 1 are connected by binding or C-shaped clamps, while the composite geotextile layers 2 are connected by applying a tear-resistant high-strength adhesive.

[0027] Furthermore, the stirrups 3 are several fiber strips distributed longitudinally along the protective bag body; the stirrups 3 are wrapped around the outer surface of the composite geotextile.

[0028] Furthermore, several of the protective bag bodies are coaxially and longitudinally connected; lowering rods 4 are provided on both sides of the lowermost protective bag body.

[0029] Furthermore, the lowering rod 4 is a reinforcing bar for connecting with the lifting equipment; the reinforcing bar is connected to the skeleton cylinder 1; and each skeleton cylinder 1 is also provided with a connecting hook 5 at its upper end.

[0030] Furthermore, the composite geotextile layers of the upper and lower protective bags are bonded together with plant-based adhesive.

[0031] Furthermore, a steel cage is installed between the protective bag and the wall of the pile foundation hole; the bottom of the lowest part of the protective bag body is sealed.

[0032] The specific implementation process is as follows:

[0033] 1. After combining the composite geotextile layer 2 with the skeleton cylinder 1, roll them into a cylinder to form a single protective bag body, which is then tied with stirrups 3. The bottom protective bag body is sealed, and the same protective bag body is formed every 3m at the top.

[0034] 2. The lower protective bag body is fixed on both sides with the lowering rod 4. The steel bar is lifted by the equipment and lowered into the borehole. Before lowering, the mud in the borehole is extracted.

[0035] 3. The upper and lower ends of the composite geotextile layer 2 should be 10cm longer than the skeleton cylinder to allow for overlap with the upper fabric. The overlap should be glued and waterproof.

[0036] 4. After lowering the steel cage to the bottom of the hole, pour concrete and vibrate it to compact it to the top of the pile to complete the pile foundation construction.

[0037] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A pile foundation protection bag, characterized in that: It includes a skeleton cylinder; a composite geotextile layer is provided on the outer side of the skeleton cylinder; the composite geotextile layer is connected to the skeleton cylinder by stirrups; the skeleton cylinder and the composite geotextile layer together form the protective bag body.

2. The pile foundation protection bag according to claim 1, characterized in that: The skeleton cylinder is a honeycomb geogrid; the composite geotextile layer includes a first geocomposite layer and a second geocomposite layer; the first geocomposite layer and the skeleton cylinder are bonded together with plant adhesive.

3. A pile foundation protection bag according to claim 2, characterized in that: Both the first and second geocomposite layers are made of carbon fiber waterproof and salt-resistant synthetic fabric; the surfaces of the first and second geocomposite layers are coated with a nano-reinforced film.

4. A pile foundation protection bag according to claim 3, characterized in that: The first geotextile layer and the second geotextile layer are bonded together with plant adhesive; the upper and lower ends of the composite geotextile layer are outside the length range of the skeleton cylinder.

5. A pile foundation protection bag according to claim 1, characterized in that: The stirrups are several fiber strips distributed longitudinally along the body of the protective bag; the stirrups are wrapped around the outer surface of the composite geotextile.

6. The installation structure of a pile foundation protection bag according to claim 1, characterized in that: The protective bag bodies are coaxially and longitudinally connected; the lowermost protective bag body has lowering rods on both sides.

7. The installation structure of a pile foundation protection bag according to claim 6, characterized in that: The lowering rod is a steel bar for connecting with the lifting equipment; the steel bar is connected to the skeleton cylinder; and each skeleton cylinder is also provided with a connecting hook at its upper end.

8. The installation structure of a pile foundation protection bag according to claim 7, characterized in that: The composite geotextile layers of the upper and lower protective bags are bonded together with plant-based adhesive.

9. The installation structure of a pile foundation protection bag according to claim 7, characterized in that: A steel cage is installed between the protective bag and the wall of the pile foundation hole; the bottom of the lowest part of the protective bag body is sealed.

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